Impkovement in stoyes and fdemoes



@eine strs zttwt @ffice 5.13.. DRISGO'LE, OF NEW YORK, N. Y. Leam- Pazem No; 71,465, dated Nomar 26, 1867.

IMPROVEMENT IN STOVES AND FURNCE TO ALL WHOM IT MAY CONCERN:

Bc it known that I, B. DRISCOLE, of NewYork city, No. 234 Water street, in the county and State of New York, have invented a ncw'and useful Improvement in Stoves andv Furnaces; and I do hereby declare that the following is :t full, clear, and exact description ther-cof, which will enable those skilled in the art to make and use the same, reference being had to the accompanyingdrawing, forming part of this specification, in which drawing- Figure 1 is a. horizontal section in the plane of the line a: x, fig. 3.

Figure 2 is a side elevation.

Figure 3 is a front elevation. y

Similar letters indicate corresponding parts.

This invention relates to stoves and furnaces which arc intended to be used with bituminous coal as fuel. f" In this illustration I have shown it in connection with a hot-air furnace or heater, but it is also applicablpe to other furnaces and stoves.

The letter a designates the gascombustion chamber of a hot-air furnace, placed directly 'over the re-pot b, and having a smoke-eduction pipe, i, leading lfrom its rear side. The Ere-pot or chamber here shown is provided with the ordinary radiating-plates g, and the sides and top of the gas-combustion chamber are corrugated or undulating. The lirepot rests upon the sides of an ash-pit, j, whose month, L', is elongated, so as to reach to the front plate e of the heater, in which I place the close door h, that closes the mouth of the ash-pit. lThis door is only opened to kindle the fire and to remove ashes and cinders from the ash-pit. At all other times, when the heater or furnace is in full operation, with bituminous or soft coal as fuel, said door is kept shut. The tire-pot is supplied with fuel through the doorf, which connects with the elongated channel or monthvl, that extends from the front plate e, and enters the front side of the combustion-chamber `inst above its place' ofjunction with the rc-pot. The grate (not 'here shown) which supports the fuel in the fre-pot, is of any suitable form or character. The supply of air to the fuel for the purpose of combustion, is obtained through pipes c, which extend from the sides of the chamber a forwards, in the direction of the front of the heater going through the wall, usually made of brick that encloses the heater, and terminating at the front in accessible positions. Their outer ends are provided with sliding'or telescopic dampers, d, which consist of half cylinders, whose outer ends arecovcred by disks of larger diameter than that of pipes c. The half cylinders slide in and out of the ends of the pipes, and when they are shoved in the whole extent, the disks at the ends of the dampers close the pipes, and prevent. thc atmospheric air from entering the combustion-chamber. The connections of the airpipes c with the combustion-chamber are air-tight, as are also the joints at the doors f and h, so as to prevent the escape of gas and smoke.

In operating the furnace, I proceed as follows: In order to start a fire, I place kindling-material and some coal in the fire-pot, and close the doorf, through which the fuel is passed in. The dampers d of the air-,pipes i" c are shoved in, so as to close said pipes, and the ash-pit door L is opened to admit air to the kindling-material. When the tire has been started, the ash-pit door h is closed, and the dampers d of the air-pipes are opened more or less, according as it is desired that the fire burn with more or less energy. The draught-air thenceforth, while the lire is kept up, is admitted only into the combustion-chamber above the fuel, where it minglcs with the smoke and gases from the fuel, and all are burned together. The fuel vwhich I design to use is bituminous coal, for which the stove or furnace is specially adapted. The air-pipes are, in this example, connected with opposite sides of chamber a, and are only two in number, but their number may be increased, and` they may enter tho combustion-chamber at various points in its sides, but it is necessary that the said pipes admit air in large amounts, of considerable volume, for the purpose of burning the dense smoke and gases which arisein burning bituminous coal. The orifices or openings in the sides of the chamber, where the pipes discharge their supply of air, are accordingly made large. The air-,pipes oran into chamber a at a height, as here shown, that `will bring the air into immediate contact with the s'ioke and `gases when they rise from the fuel, and while they are in a highly-heated state. If the pipes dischrged themselves in the upper part of chamber a, perfect ignition would not be so likely to take place as when they disc'hafrge just above the bed 0f fuel, and mingle directly with the gases beforethe latter can pass ot' into the eseapndue,

My invention is designed to accomplish the complete combustion of bituminous coal in stoves or furnaces of ordinary size and form, without being compelled to resort to expensive devices, und accordingly I have produced a stove or furnace for burning bituminous coal as fuel, in which the fire-pot, the ash-pit, and the chamber above the fire-pot, are made according to patterns in common use, the usual escape or exit-pipe i communicating directly with the interior of the combustion-chamber, thus adhering to a simple mode of constructing the stove or furnace, and accomplishing the purpose of making the same an etlicient burner of bituminous coal, by supplying, after the fire is started, all the air for supporting combustion, through air-pipes which enter the combustion-chamber above and near to the top of the fuel. In applying my invention to heaters which are enclosed when in use by walls, I extend the air-pipes c to such a length that they will reach to the front of the heater, where their dampers d can be conveniently operated.

I do not claim the mere discharge of air into a fire-chamber, for the purpose of adding air to the upward draught, which cornes into the stove bclow the ire and through the grate, as is shown in the stove of S. T. Savage, patented June 22, 1858; but having described my invention of a stove for burning bituminous coal, wherein the draught from below is to be closed while the stove s in operation,

What I claim, and desire to secure by Letters Patent, is

A close stove or furnace for burning bituminous coal, containing the following combination: a lire-pot b, to contain the bituminous coal, surmounted by a chamber, a, through which the products of combustion pass away upwards from the fire in the usual way, and air-supply passages, C, which supply all the air admitted to the fire to support combustion, at or as near as may be to the surface of thc lire, substantially as described.

J. B. DRISCOLE.

Witnesses:

Guo. F. SOUTHERN, ,ff

D. B. CHILDs. I 

